Evolution of the iPhone

They're here -- the iPhone 6 and iPhone 6 Plus officially went on sale Sept. 19. Take a look back at how far this game-changing smartphone has come.

Apple CEO Steve Jobs unveiled the original iPhone in January 2007, calling it three revolutionary devices rolled into one.

The first iPhone featured a revolutionary multi-finger touchscreen that controlled a widescreen iPod, phone and Web surfer.

Aware of its position, the device was the first to switch between portrait and landscape mode.

The phone service included "visual voicemail," making it more like email, so no more hearing older calls first.

Contacts could be shared with a PC and dialed directly, or from lists of recent or favorite calls. There is also an on-screen keypad.

Text-messaging on the phone appeared like an IM conversation. Several conversations could be kept active at once.

Making a pinching motion with two fingers can enlarge or shrink the screen, while double tapping zooms in or clicks through a link.

The iPhone 3G went on sale in June 2008. It introduced the iPhone App Store and supported assisted GPS and 3G data.

A year later, the iPhone 3GS was introduced. It looked the same as the 3G, but was faster and featured a higher resolution camera, video capabilities and voice control.

Jobs unveiled the iPhone 4 in June 2010. The new device featured video chat, could shoot and edit high-definition video and had a crisper screen resolution than the 3GS.

Philip Schiller, Apple's senior vice president of Worldwide Product Marketing, speaks about iPhones, including the new iPhone 4S, at Apple headquarters in Cupertino, Calif., on Oct. 4, 2011.

The iPhone 5 was unveiled in the fall of 2012. It's 20 percent lighter and 18 percent thinner than the iPhone 4S but has a larger screen, a more powerful 4G LTE modem and a better camera. The phone also comes with a new, faster processor called the Apple A6 and is made entirely of glass and aluminum.

The bigger screen accommodates a fifth row of icons. Users can also post to Facebook using Siri.

iPhone 5 users get up to eight hours of talk time on the iPhone 5 battery. Its speaker is 20 percent smaller, and is charged with a new "lightning" dock connector that is 80 percent smaller.

Apple unveiled two versions of the iPhone on Sept. 10, 2013. This is the cheaper model -- the iPhone 5C, which comes in five different colors with a variety of cases to choose from and costs just $99 for 16GB with a two-year contract.

The 5S comes in metallic hues and features performance upgrades, including the first 64-bit chip in a smartphone. Apple's A7 has tested at up to twice as fast as the iPhone 5's processor. There's also a fingerprint scanner for security and a motion co-processor that will let the phone be used as a fitness tracker along the lines of a FitBit.

Apple unveiled the iPhone 6 and iPhone 6 Plus on Sept. 9, 2014. The phones have curved edges and bigger screens that measure 4.7 inches and 5.5 inches, up from just 4 inches on the iPhone 5S. The larger iPhones have what Apple is calling "Retina HD" displays.

The iPhone 6 comes with more than 1 million pixels -- a third more pixels than the iPhone 5S. The iPhone 6 Plus has 2 million pixels, double the iPhone 5S' screen.

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